CRC Report No. A-34 - Coordinating Research Council
CRC Report No. A-34 - Coordinating Research Council
CRC Report No. A-34 - Coordinating Research Council
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April 2005<br />
(c)<br />
Round 4: Experiment 1<br />
CMB vs. Actual Contribution, by Receptor<br />
80<br />
70<br />
Long Beach<br />
60<br />
CMB Contribution (%)<br />
50<br />
40<br />
30<br />
Long Beach<br />
Crestline<br />
Van Nuys Hawthorn<br />
Diamond Bar<br />
Lake Perris<br />
Anaheim LAX<br />
LAX<br />
Anaheim<br />
Hawthorn Van Nuys Diamond Bar<br />
Lake Perris<br />
Crestline<br />
Gasoline<br />
Diesel<br />
Solvent<br />
Biogenic<br />
Backgd<br />
CNG and Aged<br />
LPG<br />
1:1<br />
20<br />
Lake Perris<br />
Anaheim<br />
10 Crestline<br />
Diamond Diamond Bar Bar<br />
Anaheim Crestline Hawthorn<br />
0<br />
Long Beach<br />
0.00 Anaheim Diamond Lake Van Perris<br />
Diamond Van Hawthorn Crestline Lake Long Nuys Perris Beach<br />
Nuys<br />
Bar Bar<br />
Anaheim<br />
0 10 20 30 40 50 60 70 80<br />
Actual Contribution (%)<br />
Figure 4-1. Comparison of CMB contributions to actual contributions for experiment 1 at each<br />
receptor averaged over all hours in (a) Round 1 (b) Round 2 and (c) Round 4.<br />
DRI selected seven CMB categories for the Round 1 analysis based on criteria of good CMB<br />
performance and lack of co-linearity between source category profiles. It is important to<br />
understand that these CMB categories were identified because they had different chemical<br />
compositions that, taken together, explained the “ambient” sample composition with some<br />
success. The CMB category names should not be expected to always correspond with source<br />
categories that are used in preparing emission inventories. This is because emission inventory<br />
categories are defined around activities that generate emissions rather than the chemical<br />
composition of emissions. The seven CMB categories selected by DRI for Round 1 are<br />
described in Table 4-1. The CMB categories were matched to A-<strong>34</strong> source categories used in<br />
preparing the simulated “ambient” air samples as shown in the right column of Table 4-1.<br />
Table 4-1. Categories identified by CMB in experiments 1-8 of Round 1 and the way they were<br />
matched to A-<strong>34</strong> categories actually present in the “ambient” samples.<br />
CMB<br />
Category<br />
Description/Interpretation<br />
Matched to A-<strong>34</strong><br />
Categories<br />
Gasoline Emissions related to gasoline usage. Includes<br />
exhaust, whole gasoline and gasoline vapor.<br />
1, 2, 3, 4, 5, 6, 8,<br />
9, 11<br />
Diesel Diesel exhaust. 7, 10<br />
Solvent Solvents and/or consumer products that do not 14, 15, 16, 17,<br />
resemble gasoline.<br />
CNG and Compounds that looked like CNG,<br />
<strong>No</strong>ne<br />
aged predominantly ethane.<br />
LPG Compounds that looked like LPG, <strong>No</strong>ne<br />
H:\crca<strong>34</strong>-receptor\report\Final\sec4.doc 4-3
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